after getting jumped, si-eun starts missing school and isolating himself for some days because he doesnt want anyone to see his casted arm and therefore know about it. but su-ho notices his absence. one day, he goes by his house and asks for some water as an excuse to see si-eun. even though si-eun tries to avoid him by cutting off the interaction as soon as possible and by keeping his body launguaje as steady as he can, su-ho notices, and si-eun knows he does.